A senior Hamas official said that his group was locked in "difficult" talks in Egyptian-mediated efforts in Cairo to forge a lasting cease-fire in Gaza with Israel.
"We are facing difficult negotiations. The first truce passed without notable achievements. This is the second and final cease-fire," Palestinian news agency Ma'an quoted Mousa Abu Marzouk as saying in light of the three-day halt in fighting that started on Sunday.
An Israeli official told Israel Radio that there had been no progress in the talks so far, as the gaps between the sides remained too vast.
Israeli officials said that another 72 hours were needed to cement a long-term cease-fire deal with Hamas.
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The radio station reported that the delegation was expected to agree to ease some restrictions in Gaza, including extending fishing rights, increasing the number of materials that enter Gaza, along with Israel allowing funds to enter the Strip to be used to pay the salaries of Hamas officials.
With just 72 hours of calm under the current cease-fire, Palestinians rushed to fix some of the worst of the destruction caused by the conflict started on July 8.
Sewage pipes that have been spewing raw effluent for weeks, a lack of clean water and severe power shortages are among the most urgent problems. Aid groups are distributing basic supplies like mattresses and bottles of water.
Four weeks of violence has killed 1,939 Palestinians and 67 on the Israeli side since Operation Protective Edge began on July 8.
Hamas, meanwhile, is demanding a series of measures, including an end to Israel's blockade on Gaza, an extension of fishing rights off the coast and the reopening of air and seaports.
Israeli authorities restrict the movement of goods and people in and out of Gaza, saying they need to prevent weapons being imported.
The latest outbreak of violence in the region erupted when Israel launched an offensive that it said was aimed at stopping rockets being fired from Gaza and at destroying a network of tunnels used by Palestinian militants for cross-border attacks.